package org.hot100_3;

public class leetcode19 {
    public ListNode removeNthFromEnd(ListNode head, int n) {
        ListNode dummy = new ListNode(0);
        dummy.next = head;
        ListNode slow = dummy;
        ListNode fast = dummy;


        for (int i = 0; i <= n; i++) {
            fast = fast.next;
        }

        while (fast!=null){
            fast=fast.next;
            slow=slow.next;
        }

        slow.next=slow.next.next;

        return dummy.next;
    }
}
